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Finding the Fourth Proportional to 13,186.38, 18,197.13 and 7,218

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Solution

The fourth proportional to 13,186.38, 18,197.13 and 7,218 is: 9,960.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,186.38 : 18,197.13 = 7,218 : x
  2. Step 2: Convert to fraction form
    13,186.38/18,197.13 = 7,218/x
  3. Step 3: Cross multiply
    13,186.38x = 18,197.13 × 7,218
  4. Step 4: Simplify right side
    13,186.38x = 131,346,884.34
  5. Step 5: Solve for x
    x = 131,346,884.34/13,186.38
  6. Step 6: Final answer
    x = 9,960.80

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.